Numerical simulation on distortion behavior of large diameter ratio thin-walled shell during high pressure gas quenching

doi:10.13251/j.issn.0254-6051.2020.07.048

Abstract

Abstract: A theoretical framework of metal-thermal-force coupled model of the large diameter ratio thin-walled shell was established,which is made of 30Cr3SiNiMoVA steel. The heat transfer coefficient curve at different positions was calculated through inverse heat transfer method. The distortion behavior was investigated though analyzing the evolution of the temperature field and the structure field during high pressure gas quenching process. The results show that the cooling speed on the same heat exchange surface of the shell is thin-walled position greater than top than step in the middle, and the temperature in the positive side changes more sharply. There are two peak values of the stress curves, the first one is due to the heat stress induced by the temperature, and the second one is due to the structure stress induced by the martensitic transformation. After quenching, the height of the positive side and negative side are increased by 2.08 mm (0.082%) and 2.33 mm (0.092%) respectively, and the outer diameter at the thin wall position and step in the middle are increased by 0.81 mm (0.270%) and 0.57 mm (0.186%), respectively. The measured results are basically in agreement with the simulation, and the error is less than 10%.

Key words: thin-walled shell, vacuum gas quenching, metal-thermal-force coupling, deformation behavior

CLC Number:

TG135

Zhang Xiaojuan, Zhang Jian, Ni Linyu, Zhou Zhongping, Zhang Jun, Li Junwan, Min Yongan. Numerical simulation on distortion behavior of large diameter ratio thin-walled shell during high pressure gas quenching[J]. Heat Treatment of Metals, 2020, 45(7): 231-237.

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